Maybe not the right subforum for this but I couldn't find anything appropriate. I have a relatively new (<6mo) TrippLite UPS rated for 300w. Had no problems with it until about 1~2 weeks ago when it beeped and turned off and cut power to everything in the Battery Backup ports. Everything else in my house remained powered on, as did everything in the Surge Protection ports. I thought maybe it was overloaded so I unplugged everything except my projector (which is 250w at its max) and turned it back on and ran a self test and everything was fine. Thought that fixed it but it just happened again 5 minutes ago. Any ideas before I replace it?